Its characteristics are: the tantalum-niobium alloy wire chemical composition (weight) percentage of tantalum 0.1-99.9%, beneficial doping 0.001-0.2%, niobium allowance and inevitable impurities. The tantalum-niobium alloy wire and its preparation method can effectively improve the high temperature performance and brittle-resistance of tantalum-niobium alloy wire, improve its folding performance after high temperature sintering, and also have low raw cost of conventional tantalum-niobium alloy wire and effective service length per unit weight.
Tantalum capacitors have been widely used in communication, computer, automobile, home appliances, aerospace and other fields. Tantalum electrolytic capacitors made of tantalum powder as anode and tantalum wire as anode lead have excellent comprehensive performance, including small size, large capacitance, high chip type, good reliability and long service life, etc. Therefore, it can work normally under harsh conditions that many other electrical vessels (such as ceramic and aluminum foil film capacitors) are not competent for.
The use of tantalum-niobium alloy wire can meet the strict requirements of tantalum/niobium electrolytic capacitors in terms of surface finish, dimensional accuracy, mechanical properties and electrical properties, and effectively reduce the raw material cost of capacitor anode lead, and increase the effective service length per unit weight. Therefore, tantalum niobium alloy wire is likely to replace tantalum wire as anode lead of electrolytic capacitor in the future.
In the process of electrolytic capacitor processing, tantalum niobium alloy wire is inserted into tantalum powder at medium pressure to form the mold, and then placed in a vacuum furnace through high temperature sintering at 1500-1900°C. This process can easily lead to brittle tantalum-niobium alloy wires. In order to meet the requirements of capacitor production and the quality of the final product, the anti-brittleness of anode block lead after vacuum sintering is required. In practice, tantalum-niobium alloy wire often appears brittle fracture phenomenon. It is mainly due to the migration of oxygen or nitrogen atoms in tantalum powder into tantalum niobium alloy wire and the growth of wire grain during high temperature sintering. Therefore, it is necessary to improve the brittleness resistance of tantalum-niobium alloy wire so that it can be better applied to electrolytic capacitors.
